Can with telescopic cover and method of making same



Dec. 27, 1960 FIENUP 2,966,101

CAN WITH TELESCOPIC COVER AND METHOD OF MAKING SAME Filed July 11, 1957 4 Sheets-Sheet l FIG.4.

INVENTOR. F l WILLIAM F.J.F|ENUP Dec. 27, 1960 w. F. J. FIENUPV CAN WITH TELESCOPIC COVER AND METHOD OF MAKING SAME Filed July 11, 1957' 4 Sheets-Sheet 2 FlG.7.

FIG.8.

INVENTOR. WILLIAM F.J.FIENUP Dec. 27, 1960 w. F. .1. FIENUP CAN wrm- 'IELESC'OPIC COVER AND METHOD OF MAKING SAME 7 Filed July 11, 1957 4 Sheets-Sheet 3 INVENTOR. WILLIAM F.J. FIENUP I l a I F G MQ M Dec. 27,- 1960 w, FlENup 2,966,101

can WITH TELESCOPIC COVER AND METHOD OF MAKING SAME Filed July 11, 1957 4 Sheets-Sheet 4 INVENTOR. WILLIAM F.J.F|ENUP United States Patent Qfifree 2,966,101 Patented Dec. 27, 1960 CAN WITH TELESCOPIC COVER AND METHOD OF MAKING SAlVIE William F. J. Fienup, Berkeley, Mo., assignor to R. C.

Can Company, Overland, Mo., a corporation of Mis- SOlIIl Filed July 11, 1957, Ser. No. 671,344

16 Claims. (Cl. 93-94) This invention relates to the art of paper can manufacture, and more specifically to a method applicable to the manufacture of a spirally-wound, multi-ply paper tube for a can body with separable telescopic sections adapted by its construction to be closed by ends secured to all of the plies to form the complete container.

It is one of the objects of this invention to reduce the cost of this type of can by simplifying the method of manufacture heretofore in general use. By way of example, the steps in this prior method are briefly described (1) Spirally wind an outer tube over one size of mandrel, and an inner tube over a smaller mandrel, to obtain two tubes which can be assembled telescopically.

(2) Cut the outer tube midway its length into two sections.

(3) Repeat this cutting operation on the inner tube.

(4) Assemble one outer tube section over an inner tube section.

(5) Assemble the other outer and inner tube sections.

(6) Assemble the two body sect-ions into a tube.

(7) Secure the two body sections against separation, such as by applying a label. The labeling step can be performed before or after filling the container, and in a convolute manner.

According to this invention, the method of manufacture comprises the steps of: p

(1) Spirally winding successive plies of paper tape on a single mandrel in a conventional winding machine to form an inner tube or inner paper cylinder within an outer tube or outer paper cylinder and apply an outside label, if required, all in a single operation.

(2) Cutting the tubes to the proper length for a can body and simultaneously slitting or perforating from the outside through the ply or plies of the outer tube forming the outer paper cylinder inwardly to the inner tube forming the inner paper cylinder, and slitting or perforating outwardly through the ply or plies of the inner tube forming the inner paper cylinder outwardly to the outer tube forming the outer paper cylinder. The two slits are spaced as desired.

The instant invention is based on a distinctly new concept which eliminates five distinct steps, all of which are manually performed, and substitutes machine operations which are less costly per unit on a production scale. As will be explained hereinafter, this method can be carried out on several different machines operating in distinctly difierent ways.

In the preferred manner of manufacture according to this method, four or more plies of paper are successively wound spirally on the mandrel of a conventional winding machine to form :a continuous tube. Only the second and fourth ply have an inner coating of adhesive. No adhesive is placed between the two inner and two outer plies. This method forms a continuous tube which can be cut by a flying rotary knife or saw in lengths equal to two or more cans. Each of these separated lengths of tubing is then placed upon a suitable mandrel having cooperating knives which slit or perforate from the outside through the two outer plies inwardly to the two inner plies, and through the two inner plies outwardly to the two outer plies at a spaced location from the outer perforations or slits. To insure that the knives cut completely through both outer layers and both inner layers, it will normally be necessary to cut slightly through the opposite wall to provide for any variance in the depth of the knife cut. Other knives cut completely through the entire tube, separating it into the proper lengths for each can.

It is necessary to have either two plies or more of paper for both inner and outer paper cylinders in order to hold each paper cylinder wall together when they are separated by the consumer, or to have a single ply with overlapped edges glued in order that it will hold together in the form of a cylinder. The overlapped form would normally have the disadvantage of an offset surface where it is overlapped. This construction is not as strong as two full plies, but for certain applications it may be preferable. In the same winding operation a printed label may be applied to the outer wall to give added strength and finish to the container.

After a metal end is spun on each tube, the can is shipped to the packager, who fills the tubes through the outer open end and closes the opposite open end with a metal cover. The user, or purchaser, simply twists one part of the tube with respect to the other, whichseparates the tube to form the detachable cover.

Another object of the invention is to obtain a tight fit between the inner and outer tubes or cylinders of the can body before the two body sections are separated to open the container, but a loose fit for easy reclosing and reopening. This object is attained by winding in a loose strip of paper between the inner tube and the outer tube that can be removed after opening. Removing the strip increases the clearance between the inner and outer tubes to obtain an easy slip-fit.

Another object of this invention is to provide a means of keeping the container tube sections from separating before it is intentionally opened. This result is attained by merely partially cutting the inner or outer tube, such as by perforating, which leaves small bonds of connecting paper to hold the tube sections together.

As an alternative, a narrow strip of glue may be applied to the outer surface of the inner tube during the winding operation. A twist on the sections of the tube breaks this bond so the tube sections can be separated to open the container.

It is contemplated that variations in this process 0 manufacture are possible. For example, in one of these variations illustrated hereinafter, four plies of paper tape are successively spirally wound on a mandrel to form a continuous tube, the inner two tapes have perforated lines extending on the bias across the tape so as to form registering circumferential perforations in the inner two plies for the finished tube body. These perforations are indexed by adjusting the feed angle from the tape rolls. Likewise, the two tapes forming the outer plies are similarly perforated and registered to form a circumferentially extending score in the outer two plies. The feeding of the tapes is so arranged that the inner score in the inner plies is spaced from the score in the outer plies. As in the first method, the two inner and the two outer plies are adhesively secured together. A traveling knife severs the tube to form can bodies of the proper length.

A third variation of this method is very similar to the second above described. In this method, four plies of paper tape are successively spirally wound to form a continuous tube. The two inner plies are wound on the mandrel on one side of a driving belt, and the two outer plies are wound onto the mandrel on the opposite side of a driving belt. Traveling knives are located on opposite sides of the belt. One knife scores the inner plies at a zone extending to a point where part of the score 15 engaged by the belts during scoring. The opposite knife scores the outer plies. The tubes are severed by a cut off knife'so that each tube has a score through the inner plies and a score through the outer plies which are spaced a art.

Further advantages of this invention will appear to those skilled in the art from the following detailed description of one form of the invention taken with the accompanying drawings, in which:

l is a fragmentary sectional view showing the construction of a tube for a can body according to this method;

Fig. 2 is a similar view to Fig. 1 showing one section partially separated from the can body;

Fig. 3 is a fragmentary sectional view of a can body of modified construction but manufactured according to this'method;

Fig. 4 is a similar view of the same device showing one section separated from the can body;

Fig. 5 is a fragmentary section of still another modified form constructed according to this method;

Fig. 6 is a perspective view of a complete can with parts broken away to illustrate construction;

Fig. 7 is a sectional view of the same can shown in Fi 6;

Fig. 8 is a similar view of the complete can showing the cover separated from the can body;

Fig. 9 is a top plan view of the apparatus employed for performing the scoring operation as described in the preferred method;

Fig. 10 and Fig. 11 are operational views in transverse sections taken through Fig. 9;

Fig. 12 is a fragmentary sectional view of the mandrel shown in Fig. 9;

Fig. 13 illustrates an apparatus set up for carrying out the process by winding the pre-scored paper tapes; and

Fig. 14 is a plan view of an apparatus set up for carrying out the process of separately scoring the paper strips during the winding step.

As stated heretofore, the tubes are formed of several plies of paper successively spirally wound so as to construct a continuous tube, and the tube is then severed at certain intervals to form a can of suitable length. Such a tube is shown in Figs. 1 to 5, inclusive.

Returning now to Fig. l, the tube forming the can is generally indicated as 1 and is shown as a segment of a continuous tube formed of four or more layers of paper tape or chip board spirally wound to make a four-ply tube body for a can. The four plies are indicated as 2, 3, 4 and 5. During the winding process, adhesive is applied only between the plies 2 and 3 and the plies 4 and 5. No adhesive is applied between plies 3 and 4, so that only the friction between the two center plies, 3 and '4, holds the tube together. The tube may then be placed in a separate machine and slit or perforated externally at 6 and internally as at 7 simultaneously or successively, as hereinafter pointed out. The outer slit or perforation 6 extends through the outer plies 2 and 3 and preferably also into, but not through, one of the inner plies 4. The inner slit 7 is cut deep enough to penetrate the inner plies 4 and 5 and also, preferably, somewhat into the outer ply 3. The slitting operation performed on the tube 1 makes possible the separation of the can body 8 from the cover 9, as shown in Fig. 2. Usually the metal can ends are applied before the cover is removed, as shown in Fig. 6 and hereinafter described in detail. The packager maypurchase the can in this form if he desires, and later paste a label around the outer side of the. can after it is filled with the material, to hold the can in assembled relation until after it is opened by the consumer. However, generally the pack ager desires the can shipped to him as shown in Fig. 7, so that the can may be filled, the end cover applied, and the package mechandized in the assembled condition. The consumer may twist the can with respect to the cover and remove the cover.

Another form of the same invention is shown in Figs. 3 and 4. In this form, a tube 10 is continuously formed in a spiral winding machine which applies five plies of paper tape. These plies are indicated by the reference characters 11 through 15. In this construction, adhesive is applied in the winding machine forming the continuous tube between the plies 11 and 12 and 14 and 15. None, however, is applied between the plies 12 and 13 and 13 and 14. The ply 13 is of light, thin paper. During the slitting operation performed as above described, the outer plies 11 and 12 are slit inwardly at 16 through the plies 11, 12 and 13, and the inner plies 1 3, 14 and 15 are slit along the line 17. The slit 17 extends outwardly through the inner plies 15 and 14, and also preferably through the ply 13 and slightly into the ply 12.

As shown in Fig. 4, a twist of the can body with respect to the cover separates the cover 18 from body 19 along the parting lines 16 and 17. The layer of paper 13 is discarded, since its only purpose'is to add space between the plies 11 and '12 and 14 and 15 for easier reclosing.

In Fig. 5 the tube generally indicated as 20 is formed in the same manner as above described for the preceding modifications except that it is a five-ply tube. The fifth ply 21 is preferably a label. The plies are indicated as 21 to 25, inclusive. In this modification, the tube is perforated inwardly at 26, with the perforations extending inwardly through plies 21, 22 and 23, all of which are adhesively secured together. The tube is also slit outwardly at 27 through the plies 25 and 24, which are also secured by adhesive. No adhesive is applied between the plies 23 and 24, however. In this modification, separation of the cover 29 from the can body 28 will be indicated by the rupture of the label on the outside of the can, which makes the can a type of non-refillable container.

Fig. 6 illustrates a complete can, which includes the multi-ply can body 1 such as described in Fig. l, slit externally at 6 and perforated internally at 7. The metal can ends 30 and 31 are spun into place after the can is filled.

After the abovementio-ned forming steps performed on the tube, usually one metal end 30 is spun'onto the tube, and the can is ready for shipment to the packager, who fills the can through the open end and applies the end cover 31. The consumer purchasing the filled can opens the can by simply twisting the body sections with respect to one another, which fractures the outer perforated plies along the line of the perforation, so that the cover can be easily removed, all as shown in Fig. 8. There is no adhesive between the outer and the inner plies, so that the cover readily slides off the body of the can. This makes a very convenient container, since it may be readily reclosed by the consumer to keep the product free of foreign matter. Furthermore, it is readily apparent from a casual inspection whether the container seal has been broken or not, thus indicating to the consumer the genuine nature of the contents of the can.

APPARATUS FOR CARRYING OUT THESE METHODS First form Figs. 9 to 14, inclusive, illustrate machines for carrying out the process of scoring and cutting.

Referring first to Figs. 9 and 12, a mandrel 32 driven by shaft 33 carries a series of rotary knives 34. On opposite sides of the knives are rubber rolls 35 and 36 which are held in place on the driven shaft 33 by steel spacing rolls 37. As will be seen with reference to Fig. 12, the diameter of the knives 34 and the rubber rolls 35 and 36 are the same, while the diameter of the steel spacing rolls 37 is slightly less. In this instance, the difference in diameters is equal to the thickness of the two inner plies of paper forming the can body 1. Adjacent the mandrel 32 is a second mandrel 33 which carries a plurality of spaced knives 40 and 41. The knives 40 are properly spaced and protrude from the mandrel 39 a distance necessary to cut completely through the four plies of paper so as to form a can body of the proper length. The series of knives 41, however, are of a diameter with respect to the mandrel 39 sufiicient to cut through only the outer two plies of the tube 1. Mandrel 39 is generally mounted movable with respect to the mandrel 32, and is forced into engagement therewith by a compressed air motor triggered in its operation by some manual means.

Operation of form one Tubes three or four times can length, as they are received from the winding machines, are placed on the rotating mandrel 32 against the collar 33a. The trigger device of the air motor is then actuated, forcing the mandrel 39 into rolling contact with the outside of the paper tube. Fig. shows the position of the parts with one knife 40 beginning to engage the outside of the paper tube. In this figure, the tube is shown as formed of two plies. This is for purposes of convenience in understanding the operation. As the cutting progresses, the knife 40 goes through the paper tube 1 into contact with steel roll 37. The pressure of the mandrel 39 flattens out the rubber rolls 35 and 36, exposing the edge of the knife 34 an amount to cut through the inner ply of the tube 1, while knife 41 cuts the outer ply.

In one operation, the tube is severed into the proper length for several cans, each can is scored inwardly and outwardly to form a telescoping can body. When the operator releases the trigger, the mandrel 39 separates, withdrawing the knives, and the tubes 1 can be ejected manually or by machine.

Second form Fig. 13 is more or less self explanatory of the manner of manufacture heretofore briefly described. The apparatus is more or less conventional and comprises a stationary mandrel 42, a driving belt mechanism 43, and a traveling knife 44 which cuts the tube into can lengths. According to this process, each of the tapes 2, 3, 4 and S are suitably scored at 45, 46, 47 and 48, respectively, and wound upon the mandrel by the belt 43 in such a manner as to space the scoring on the inner plies with respect to the outer plies, as shown at 49 and 59. The mechanism for spacing the score marks and bringing the perforations into registry have not been illustrated, since they form no part of the present invention.

Third form In the apparatus shown in Fig. 14, four paper tapes 6063 are wound on a stationary mandrel 65 by a pair of driving belts 67 and 68 which are driven in synchronism. Belt 67 is located between the tapes 6061 and 6263 and winds the first two plies, one of which is coated with adhesive by applicator roller 70. Belt 68 winds the outer plies 62 and 63, one of which is also coated with adhesive by the applicator roller 71. This machine secures the inner two plies together, and then applies the outer two plies and secures them together.

The cutter assembly 75 has a plurality of knives 76, 77 and 78 which move into engagement with the paper tube and travel with it at the same speed. This action may be timed mechanically or electrically. The knives 76 and 78 are the same size or diameter, and both cut completely through the tube. Knife 77 is smaller in diameter, so that it cuts completely through only the outer two plies 62 and 63.

Knife 76 may sever the tube or score the tube so as to weaken the structure. In either case, the score is immediately covered by tape 62 so that the tube cannot separate.

The spacing of the knives is wholly optional, but, as illustrated, knives 76 and 77 produce spaced cuts through the inner and outer plies as shown at 7? and 80. Knife 78 cuts the tube to proper length for a can body.

Certain structures have been described herein which will fulfill all the objects of the present invention, but it is contemplated that other modifications will be obvious to those skilled in the art which come within the scope of the invention as defined by the appended claims.

I claim:

1. The method of manufacturing a paper tube with a telescoping section comprising the steps of successively winding a plurality of paper tapes in a spiral manner to form a multi-ply tube, forming circumferential scores through the inner ply and through the outer ply, spaced from each other along the length of the tube, and severing the tube completely beyond each pair of scores along the length of the tube to form individual tubes for a can body having internal and external scored plies.

2. The method of manufacturing a multi-ply paper tube with a telescoping section comprising the steps of successively winding a plurality of paper tapes in a spiral manner to form a multi-ply tube with the inner plies adhesively secured and the outer plies adhesively secured to form a multi-ply inner tube within a multi-ply outer tube, forming circumferential scores through the inner tube and through the outer tube at spaced locations in the length of tube, and severing the tube completely beyond each pair of scores along the length of the tube to form individual tubes for a can body, each having acircumferentially scored inner tube and a circumferentially scored outer tube.

3. The method of manufacturing a paper tube with telescoping sections comprising the steps of successively winding a plurality of paper tapes in a spiral manner to form a continuous multi-ply tube, cutting said tube in sections of uniform length and then placing a section of said tube on a suitable mandrel between oppositely facing knives, operating said knives to cut outwardly through said inner ply and inwardly through said outer ply at spaced locations in the length of the tube, and severing the tube completely to form individual tubes for a can body, each having an internal and an external scored ply.

4. The method of manufacturing a multi-ply paper tube with telescoping sections for a can body and a can cover comprising perforating a plurality of paper tapes transversely, spirally winding the plurality of tapes successively on a mandrel so that transverse perforations are held parallel in a manner forming circumfe-rentially arranged scores through the inner ply and through the outer ply at spaced locations in the length of the tube and severing the tube completely at spaced intervals to form individual tubes for a can body having an internal and an external scored ply.

5. The method of manufacturing a multi-ply paper tube with telescoping sections for a can body and a can cover comprising the steps of succesively winding a plurality of paper tapes in a spiral manner to form a multiply continuous tube, moving the tube between oppositely acting spaced rotary knives, operating said knives to cut an inner ply of the tube circumferentially at one location in the length of the tube, and an outer ply circumferentially at another location in the length of the tube, and also to sever all of the plies of the tube on either side of said first cuts to form individual tubes for a can body, each having internal and external spaced scoring forming telescoping sections between the plies.

6. The method of manufacturing a multi-ply paper tube with telescoping sections for a can body and a can cover comprising the steps of successively winding a plurality of paper tapes in a spiral manner on a stationary mandrel to form a multi-ply continuous tube by moving the tube along said mandrel, feeding said tube over and between knives disposed at spaced locations along a section of said tube, operating said knives tocut the inner ply of said multi-ply tu'be outwardly from the inside of said tube and the outer ply of said multi-ply tube inwardly from the outside of said tube to partly sever said tube by adjacent scoring, and also cutting circumferentially to sever the tube completely on either side of said first cuts to form individual tubes for a can body, each having internal and external spaced scoring to form telescoping sections between the plies.

7, The method of manufacturing a paper can body with telescoping sections comprising the steps of successively winding at least three paper tapes in a spiral manner to form a paper tube with separate plies, applying adhesive during the winding operation to secure the tapes to form an inner ply and an outer ply with a loose separator ply between, forming spaced circumferential scores through the inner ply and through the outer ply at spaced locations along the tube, and severing both tubes on either side of said scores to form a can body with spaced scoring forming a telescopic connection between the inner and outer plies.

8. The method of manufacturing a paper can body with telescoping sections comprising the steps of successively winding a plurality of paper tapes in a spiral manner to form a paper tube with separate plies, applying adhesive during the winding operation to secure the tapes to separately form a unitary inner tube and a unitary outer tube, tacked together by a narrow strip of adhesive between said tubes, severing the inner tube and the outer tube circumferentially at spaced locations in the length of the tube in the region where said tubes are tacked, and severing the tube completely to form individual can bodies with spaced scored telescoping sections.

9. The method of manufacturing multi-ply paper tubes with telescoping sections, comprising the steps of winding a plurality of paper plies from a plurality of paper tapes to form a continuous paper tube with an inner paper cylinder, concentric with an outer paper cylinder, severing the continuous paper tube to form individual tubes for can bodies, forming circumferential scores from the inside outwardly into the inner paper cylinder, and from the outside inwardly into the outer paper cylinder, at spaced locations along the length of the inner and outer individual paper cylinders to form individual tubes for individual can bodies with telescoping sections between the circumferential score in the inner paper cylinder and the circumferential score in the outer paper cylinder.

10. The method of manufacturing paper tubes with telescoping sections, comprising the steps of winding a plurality of paper plies from a plurality of paper tapes to form paper tubes with an inner paper cylinder concentric with an outer paper cylinder, forming pairs of spaced circumferential scores in each paper tube so that one score of each pair of scores is cut from the inside outwardly into the inner paper cylinder, and one score of each pair of scores is cut from the outside inwardly into the outer paper cylinder, to form individual tubes for individual can bodies with tel'esc'oping sections between the circumferential score in the inner paper cylinder and the circumferential score in the outer paper cylinder.

11. The method of manufacturing paper tubes with telescoping sections, comprising the steps of winding a plurality of paper plies from a plurality of paper tapes to form a continuous paper tube with an inner paper cylinder concentric with an outer paper cylinder, forming spaced pairs of spaced circumferential scores along said paper tube so that one score of each pair of spaced scores is cut from the inside outwardly into the inner paper cylinder, and one score of each pair of spaced scores is cut from the outside inwardly into the outer paper cylinder, and severing the paper tube between said pairs of scores to form individual tubes for individual can bodies with telescoping sections between the circumferential score in the inner paper cylinder and the circumferential score in the outer paper cylinder.

12. The method of manufacturing paper tubes with telescoping sections, comprising the steps of winding one or more paper tapes in a spiral manner to form a tube with adjacent spiral convolutions of the paper tape adhesively secured to form an integral inner paper cylinder, winding one or more paper tapes in a spiral manner with adjacent spiral convolutions of the paper tape adhesively secured to form an outer paper cylinder concentric with said inner paper cylinder, forming spaced pairs of spaced circumferential scores along said paper tube so that one score of each pair of spaced scores is cut from the inside outwardly into the inner paper cylinder, and one score of each pair of spaced scores is cut from the outside iiiwardly into the outer paper cylinder, and severing the paper tube between said pairs of scores to form individual tubes for individual can bodies with telescoping sections between the circumferential score in the inner paper cylinder and the circumferential score in the outer paper cylinder.

13. The method of manufacturing paper tubes with telescoping sections, comprising the steps of winding one or more paper tapes in a spiral manner to form a continuous paper tube with adjacent spiral convolutions of one or more of said paper tapes adhesively secured to form an integral inner cylinder, winding one or more paper tapes in a spiral manner with adjacent spiral convolutions of one or more of said paper tapes adhesively secured to form an outer paper cylinder, concentric with said inner paper cylinder, severing the continuous paper tube to form individual tubes for can bodies, forming circumferential scores from the inside outwardly into the inner paper cylinder, and from the outside inwardly into the outer paper cylinder, at spaced locations along the length of the individual paper tubes to form individual tubes for individual can bodies with telescoping sections between the circumferential score in the inner paper cylinder and the circumferential score in the outer paper cylinder. 7

14. The method of manufacturing paper tubes with telescoping sections, comprising the steps of winding a plurality of paper tapes in a spiral manner to form paper tubes with a plurality of paper plies adhesively secured to form an inner cylinder and a plurality of paper plies adhesively secured together to form an outer paper cylinder concentric with said inner paper cylinder, forming pairs of spaced circumferential scores in each paper tube so that one score of each pair of scores is cut from the inside outwardly into the inner paper cylinder, and one score of each pair of scores is cut from the outside inwardly into the outer paper cylinder, to form individual tubes for individual can bodies with telescoping sections between the circumferential score in the inner paper cylinder and the circumferential score in the outer paper cylinder.

15. The method of manufacturing paper tubes with telescoping sections, comprising the steps of winding one or more paper tapes in a spiral manner to form a tube with adjacent spiral convolutions of the paper tape adhesively secured to form an integral inner paper cylinder, Winding one or more paper tapes in a spiral manner with adjacent spiral convolutions of the paper tape adhesively secured together to form an outer paper cylinder, concentric With said inner paper cylinder, forming pairs of spaced circumferential scores in each paper tube so that one score of each pair of scores is cut from the inside outwardly into the inner paper cylinder and one score of each pair of scores is cut from the outside inwardly into the outer paper cylinder, to form individual tubes for individual can bodies with telescoping sections between the circumferential score in the inner paper cylinder and the circumferential score in the outer paper cylinder.

16. The method of manufacturing paper tubes with telescoping sections, comprising the steps of winding one or more paper tapes on a mandrel in a spiral manner to form a paper tube with adjacent spiral convolutions of said paper tape adhesively secured together into an inner integral paper cylinder, scoring said inner paper cylinder circumferentially from the outside inwardly toward the mandrel by a moving cutter so as to form a tear line circumferentially of said inner paper cylinder, winding one or more paper tapes on said inner paper cylinder concentric therewith, and with adjacent spiral convolutions of said paper tape adhesively secured into an outer integral paper cylinder, scoring said outer paper cylinder circumferentially at a location spaced from the score in said inner paper cylinder by a moving cutter to form a score line circumferentially of said outer paper cylinder, and then severing the paper tube between said pairs of scores to form individual tubes for individual canbodies with telescoping sections between the circumferential score in the inner paper cylinder and the circumferential score in the outer paper cylinder.

References Cited in the file of this patent UNITED STATES PATENTS 1,390,644 Ritchie Sept. 13, 1921 1,932,169 Allen et al. Oct. 24, 1933 2,310,818 Tompkins Feb. 9, 1943 2,638,820 Barnes May 19, 1953 

